<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script>
  //1.无参无返回值方法
  function f1(){
  console.log("f1")
  }
  f1();
  //2.有参无返回值方法
  function f2(name, age){
    console.log(name+":"+age );
  }
  f2("张三",50);
  //3.无参有返回值
  function f3(){
    return "这是返回值";
  }
  let info = f3();
  console.log(info);
  //4.有参有返回值
  function  f4(x,y){
    return x*y;
  }
  let result = f4(5,9);
  console.log(result);
  //第二种定义方法的方式
  let f5 = function (name,age) {
    console.log(name+":"+age);
  }
  f5("李四",30);
  //第三种定义方法的方式
  let  f6 = new Function("name","age","console.log(name+':'+age);
          f6("王五",20);

</script>
</body>
</html>